In addition to the poker hand, this term also means to chuck it in her twice, i.e. double penetration.

Rob: "Full house! What, bitch!?!!"
Bob: "Double chuck! I win! Who da man!?!?"
Rob: "Speaking of double chuck, the mailman and I double chucked your ho-bag wife yesterday. Looks like I'm the real winner."
Bob: "Why that skank-ass whore-ass cock-a-minute slut bag. Looks like you are the winner! WWWWWhaat do we have for him, Johnny? Oooooh, you win showcase #3...genital warts, chlamydia, and crabs! Hope you have yourself a field day with that, motherfucker!"